Electric-arc lamp



2 Sheets-Sheet 1.

(No Model.)

W. E. CADY. ELECTRIC ARC LAMP.

No. 434,175. Patented Aug. 12, 1890.

WITNESSES:

ATTORNEY.

2 sheets sheet 2.

(No Model.)

W. E. GADY. BLEQTRIG ARC LAMP. No. 434,175. .Patented Aug. 12,1890.

ITNESSES:

WZZWWLZ'. 641633. 125W yQW ATTORNEY.

TKi Hun zia wanna 9 mm'o-umn., WASHINGTON, a c.

UNITED STATES PATENT OFFICE.

WILLIAM E. CADY, OF COREY, PENNSYLVANIA.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 434,17 5, dated August12, 1890.

Application filed March 27, 1890.

To all whom it may concern.-

l 3e it known that I, \VILLIAM E. CADY, a citizen of the United States,residing in Corry, 1n the county of Erie and State of Pennsylvama, haveinvented certain new and useful .Improvements in Are Lamps, of which thefollowing is a specification.

My invention relates to that class of arc lamps 1n which the uppercarbon is lifted to establish the are by means of an electro-magnet inthe main circuit and is fed downward by the action of gravity controlledby the action of a shunt-magnet; and my improvements relate to the meansoperated by the main magnet for lifting the upper carbons, to the meansfor clamping the lower carbons 1n the frame, and the means for shiftingthe current in a double-carbon lamp from the burned-out set to the otherset.

My invention consists in the construction and operation of parts, ashereinafter described, and pointed out in the claims.

In the drawings which accompany and form a part of this specification,Figure l is a side elevation of a portion of a lamp embodying some of myimprovements. Fig. 2 is a side elevation of the same at right angles toFig. 1. Fig. 3 is a section on line 3 3 of Fig. 1, lookm g upward. Fig.4is an under plan View of the mechanism for operating the upper carbonof a double-carbon lamp. Fig. 5 is a section on line 5 5 of Fig. 4. Fig.6 is a detail, partly in section, of the device for clampmg the lowercarbon; and Fig. 7 is a plan of the split screw shown'in Fig. 6. Fig. 8is a perspective detail of parts of the doublelamp-operating mechanism,and Fig. 9 is a diagrammatic View of the circuits.

Referring to Figs. 1, 2, and 3, A is the arestriking magnet, composed ofthe spools a, connected by the soft-iron bar a and supported in anysuitable manner by the frame of the lamp, the pole-pieces of said magnetbeing shown at a B is the shunt-magnet, supported in any suitable mannerin the position shown, and with its pole-pieces h in the plane of poles(L The armaturcs a and b of the magnets A and B respectively are securedto the ends of lever O, pivoted in the frame at c and 113V. ing acentral hole 0' for the passage of the upper-carbon rod D, and a slot 0in which is pivoted the link 8 of clamp E. This clamp Serial No.345,560. (No model.)

consists of a plate having a hole slightly larger than the rod D, whichpasses through it. The other end of the plate rests upon a set-screw c.When the link 6 is lifted by the action of lever O and magnet A,thesides of the hole in the clamp grasp the rod D and raise it. Theset-screw e can be adjusted to vary the point at which the clamp willgrasp the rod, and the action of the armature-lever is cushioned andadjusted by the coil-spring F, connected at its lower end to the lever Oat f and at its upper end to a screw-threaded rod f, which passes up andthrough ahole in a suitable part of the frame and is provided with theadj usting-nut f. The rod has a rack 01, meshing with the retarding-geard (1 d the object of said gearing being to render the descent of theupper carbon a slow movement after it has been lifted by the clamp E.

G are posts connected to but insulated from the, frame of the lamp, aportion of which is shown at X, and to these posts the positive andnegative wires are connected.

H is a metal strip over the post G and carricd by the armature-lever C,said strip when the lamp is cut out resting on posts G and forming acircuit through the lamp.

I is a resistance-coil located under the opposite end of'lever O.

In an openingj in the bottom of the frame formed by a ring or sleeveprojecting above and below the frame (see Fig. 6) is a hollow splitscrew J, having an enlarged head j',the lower end of said screw beingprovided with a nut 3' having a concave upper surface, which is greaterin diameter than the ring of the opening. Through the hole in the screwa lower carbon can be passed from below the lamp without removing theglobe, and said carbon is clamped by setting up nut 7' resulting incompressing the sections of the split head on the carbon. The concavityof nut j allows the clamp to hold the carbon at the proper angle to meetthe end of the upper carbon. I

The operation of the parts above described is as follows: The carbonsbeing properly set and the current turned on, the action of the magnet Astrikes the are by lifting the upper carbon through the medium of rod D,clamp E, link 6, and armaturalever C. As the are increases, the magnet Bincreases in strength (aided, if necessary, by the spring F) andreverses the motion of lever 0, thus lowering link 6 and releasing clampE, the end of which will rest on screw 6. The descent of rod D is slowowing to the retarding-gear clamp E.

In Figs. 4 and 5 I show the mechanism for alternately operating theupper carbons of a double lamp, it being understood that the mechanismfor lifting and retarding the upper carbons and for clamping the lowercarbons is the same as shown and described above for the single-carbonlamp. In this double construction the four spools of the two magnets arerelatively arranged the same as in theformer; but instead of aresistancecoil I being employed,a magnetK in the cutout circuit iscentrally arranged relatively to the said spools. The core of thismagnet K 1s provided at its lower end with a hook 7c. The armature-leverO is shaped, as in the other form, like a Greek cross and similarlypivoted. The arms of the lever which carry the pivots are curved, asshown in Fig. 4, to allow passage of the two carbon rods D. As shown inFig.4, a bar 6 centrally secured to the lever C, carries a link e ateach end, said link having a slot 6 at its upper end (see Fig. 5) toreceive the end of bar 6 The object of the slot (2 will presently beexplained. The two links carry the twoclamps E for the carbons, and theclamps are extended beyond the point of connection of the links to formbearing-surfaces, against the under portion of which the arms Z ofrockshaft L are adapted to alternately bear. The rock-shaft L is mountedinbearings on the frame of the lamp under clamps E. The arms Z are atright angles to each other, and in Figs. 4 and 5 one arm Z is shownhorizontally. The other arm does not show in Fig. 4, because it isbeyond shaft L, and does not appear in Fig. 5, because said figure isasection between the two arms.

T o the rod-shaft is secured a lever having an operating-handle Zprojecting below the frame and having an upwardly projecting arm Z towhich is pivoted a dog Z", which rests in hook k and has its endprovided with a shoulder Z resting against post Z. A spring Z connectsthe arm Z with post Z and keeps the shoulder Z in engagement with thepost when in the position shown in Fig-5.

In operation the parts are set, as shown, with one of the upper carbonslifted out of use by one of the arms Z holding up its clamp E. When theother burning carbon is burned out or broken, the current passingthrough magnet K raises its core and hook 7c, and thus releases theshoulder Z of the dog from the post and allows spring Z to rock theshaft L, thus turning'up the arm Z that was down and turning down theother, and so striking the arc of the other pair of carbons. The slots ein links 6 permit the lifting of one carbon rod without disturbing theother. \Vhen both carbons are burned out, the trimmer carbons first theone last burned out, and then by handle Z rocks shaft L, lifts thatcarbon, sets dog Z and supplies the second carbon.

In Figs. 1 to 8 of the drawings the circuit connections are omitted toavoid confusion; but for the construction in Figs. 1, 2, and 3 they willbe as ordinarily used, the current passing through resistance-coil Iwhen the lamp is cut out. For the construction shown in Figs. 4 and 5the connections are, as shown in Fig. 9, such that the magnet K takesthe place of the usual resistance-coil, while also acting to bring thearc-changing mechanism into operation.

Having now described my invention, what I claim, and desire to secure byLetters Patent, is

1. The combination of the frame having a sleeve projecting above andbelow it, a 1101- low split screw having an enlarged head fitting theupper end of said sleeve, and a nut having a concave face fitting thelower end of the sleeve, substantially as described.

2. In a double-carbon lamp, the combination, with clamps for lifting theupper-carbon rod, of a rock-shaft having arms projecting from it atdifferent angles, one under each clamp, and means for operating therock-shat t, substantially as described.

3. In a double-carbon lamp, the combination, with clamps for lifting thecarbon, of a rock-shaft having arms projecting from it at differentangles, one under each clamp, a lever secured to the rock-shaft, astop-clog also connected to the rock-shaft, a magnet for releasing thestop-dog, and a spring for rocking the shaft in one direction,substantially as described.

4. In a double-carbon lamp, the combina tion of armature lever 0, havingbar 6 slotted links 6 at theends of said bar, and carryinglifting-clamp, and means for alternately lifting one clamp independentlyof the other, substantially as described.

5. The combination of magnets A and B, cut-out magnet K, having a coreprovided with hook 7c, lever C, having bar e and two lifting-clamps E,rock-shaft L, having arms Z under clamp O, and having also lever Z,spring Z and dog Z adapted to rest in said hook 70, substantially asdescribed.

6. In a double-carbon lamp, the combination, with mechanism foralternately chang ing the current from one pair of carbons to the other,of an electro-magnet for operating said mechanism, said magnet formingthe resistance for the cut-out circuit, substantially as described.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

XVILLIAH E. OADY.

Witnesses:

ALBERT GIsEL, ED. B. ARCHIBALD.

